lumen
SI unit of luminous flux (the amount of light passing through an area per second).
The lumen is defined in terms of the light falling on a unit area at a unit distance from a light source of luminous intensity of one candela. One lumen at a wavelength of 5,550 angstroms equals 0.0014706 watts.
lumen
In biology, the space enclosed by an organ, such as the bladder, or a tubular structure, such as the gastrointestinal tract.
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